On Wed, Feb 10, 2021 at 11:44 AM Peter Luschny <[email protected]> wrote: > > The compositional inverse (with respect to x) of > > y(t, x) = x - t*(exp(x) - 1) > > is > > 1/(1-t)*y + t/(1-t)^3*y^2/2! + (t+2*t^2)/(1-t)^5*y^3/3! + > (t+8*t^2+6*t^3)/(1-t)^7*y^4/4! + ... > > Apparently multivariate power series rings do not know how > to reverse a series. > > Perhaps there is a workaround?
one can try to see if working with univariate series over R(t) will give the needed inverse. > Thanks! > > > -- > You received this message because you are subscribed to the Google Groups > "sage-support" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sage-support/b70394ce-3b11-412e-8a1d-3acd89ace6c6n%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/CAAWYfq0DeMRhX_%3DKyL-kGnjCD_vH_-s53nx86HhcDzeXNxrFPA%40mail.gmail.com.
